ORCID Profile
0000-0002-9460-8847
Current Organisations
Universidade de São Paulo
,
Universidade de São Paulo Escola de Educação Física e Esporte de Ribeirão Preto
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Publisher: Public Library of Science (PLoS)
Date: 31-12-2018
Publisher: Informa UK Limited
Date: 15-12-2021
DOI: 10.1080/24733938.2021.2014550
Abstract: The current study examined the possible relationships between one-off single night sleep metrics and subsequent kicking performance in a youth soccer context. Twenty-eight under-17 academy players (15.9 ± 0.8 years-old) completed a kick testing protocol consisting in 20 attempts, 18 m from the goal and against a goalkeeper. Four digital video cameras (240 Hz) allowed to determine 3-D approach run, lower limb and ball velocities. Two additional cameras (60 Hz) were used to calculate 2-D mean radial error, bivariate variable error and accuracy. Over 24 h prior to testing, players were monitored by wrist actigraphy to determine their sleep indices. Self-reported sleep quality, sleepiness and chronotype scale scores (Horne and Östberg morningness-eveningness questionnaire) were also collected immediately before kicking experiment. Multiple linear regressions indicated that wake up time and chronotype contributed to 40% of mean radial error. Self-reported sleep quality influenced respectively on 19% and 24% of accuracy and bivariate variable error variances. Taken together self-reported sleep quality and wake up time explained 33% of accuracy (all One-off sleep measures showed some sensitivity to acutely detect inter-in idual oscillations in kicking performance. Low perceived sleep quality, later wake up time and a chronotype toward evening preference seem either related to immediately subsequent worst ability of ball placement when kicking. Monitoring sleep-wake transition and perceived sleep quality may be important to help prevent acute performance declines in targeting the goal during kick attempts from the edge of penalty area.
Publisher: Informa UK Limited
Date: 18-06-2020
Publisher: Wiley
Date: 24-04-2021
DOI: 10.1111/SMS.13969
Abstract: We designed and tested a protocol for measuring the performance of in iduals in small‐sided soccer games. We tested our protocol on three different groups of youth players from elite Brazilian football academies. Players in each group played a series of 3v3 games, in which in iduals were randomly assigned into new teams and against new opponents for each game. We calculated each in idual's average in idual goals scored, goals scored by teammates, goals conceded, and net team goals per game. Our protocol was consistent across days and repeatable across groups, with intraclass correlation coefficients (ICCs) of 0.57–0.69 for average net goals per game across testing days. Players could achieve high success by scoring goals or ensuring their team concede few goals. We also calculated the first and second dimension of a principal component analysis based on each player's number of goals scored, goals scored by teammates, and number of goals conceded per game. Players that were overall high performers had higher PC 1 scores, while PC 2 scores represented the type of contribution made by a player to overall performance. Positive PC 2 values were indicative of high number of in idual goals while negative values were associated with more goals from teammates and fewer conceded goals. Our design allows coaches and scouts to easily collect a robust metric of in idual performance using randomly designed, small‐sided games. We also provide simulations that allow one to apply our methodology for in idual talent identification to other small‐sided games in any team sport.
Publisher: SAGE Publications
Date: 11-08-2023
DOI: 10.1177/17479541221117630
Abstract: In many youth sports, selection into elite training academies is dominated by athletes born earlier in the year. Previous research suggests this is partly due to these athletes being more physically developed than their younger peers. How athletes born later in the year survive in elite academies is less understood. Here, we tested the hypothesis that players born later in the year are more technically skilled than their peers born earlier in the same year. Using 150 youth players (10–19 years of age) from an elite Brazilian soccer academy, we measured each player's date of birth, height, and mass sprinting ability dribbling ability and kicking accuracy and speed. We found most players in this academy were born in the first half of the year, and those born earlier in the year (relatively older) tended to be taller and heavier than those born later in the same year (relatively younger). In addition, relatively older players were faster when sprinting and dribbling the ball in a straight line. Conversely, relatively younger players were more accurate when passing the ball with their nondominant foot, providing some evidence these players were more technically skilled than their older peers of the same age. We suggest skill tests with youth players need to consider relative age and physical size in order to best assess a player's potential.
Publisher: Informa UK Limited
Date: 23-11-2019
DOI: 10.1080/02640414.2018.1544110
Abstract: This study assessed whether a new, closed-skill dribbling or sprinting task could predict attacking performance in soccer. Twenty-five male players were recruited from the Londrina Junior Team Football Academy in Brazil and asked to either dribble the ball or sprint through five custom circuits that varied in average curvature (0-1.37 radians.m
Publisher: Hindawi Limited
Date: 08-04-2020
DOI: 10.1002/TSM2.142
Location: Brazil
Location: Brazil
Location: Brazil
No related grants have been discovered for Paulo Santiago.